Legend has ______ that CaoCao, King of Wei kingdom in the Three Kingdoms period, built 72 tombs to confuse tomb diggers.
A. it B. this C. them D. itself
It is high time we ______ awareness of environmental protection.
A. promoted B. would promote C. shall promote D. had promoted
How can they learn anything useful ______ they spend all their spare time playing online games?
A. while B. unless C. although D. when
______ is it that metals plays such an important part in our daily life?
A. Why B. What C. Where D. When
He is strict and kind-hearted teacher, ______ the children respect but are a bit afraid of.
A. which B. that C. one which D. one whom
They have the right to check ______ the will is valid(有效的), of course.
A. whether B. why C. when D. how
